Lock



Nov. 21, 1933.

L. J. MILITELLO ,936,138

LOCK

Filed May 11., 1953 2 Sheets-Sheet 1 j .6 m 7 f} 5 Inventor '76, Z (21212222 9216 V flmm section of the casing removed.

7 members '7 and 8,

Patented Nov. 21, 1933 MW -muwr LJNtT-Eh STATES PATENT OFFICE LOCK I Louis John Militello, wood River, 111. Application May 11, 1933. Serial No. 670,576

2 laims. (c1. 'm -m This invention relates to a lock, the general object of the invention being to provide a lock of simple and inexpensive construction and one which cannot be picked or the bolt cut, as said bolt is located in thelock casing and engages a keeper member which enters the casing.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which:-

Figure 1 is a front view of the lock.

Figure 2 is an edge view thereof.

Figure 3 is view of the interior parts, with one Figure 4 is a section on line 5-5 of Figure 3.

Figure 5 is a section on line 6-6 of FigureB.

Figure 6 is a section on line '7-'7 of Figure 3.

Figure 7 is a section on line 7-7 of Figure 6.

Figure 8 is a sectional detail view showing the key in the lock.

Figure 9 is a view of the plunger rod.

Figure '10 is a view of the bolt.

Figure 11 is a view of the trigger for holding the bolt in retracted position.

Figure 12 is a view of the key;

Figure 13 is a view of the keeper member.

In these drawings, the numeral 1 indicates the lock casing and the numeral 2 the cover plate for the casing, these parts being connected together by the rivets 3. As shown, the casing and plate 2 are preferably of heart shape. The plate is formed with a keeper receiving opening 1 and the casing with a similar opening 5. The lock bolt is shown at 6 and a pair of substantially U-shaped guiding members '7 and 8 are fastened to the plate 2, one on each side of the opening or slot 4, these members being placed on the plates 9 and these members act to guide the bolt 6. A lip 10 is formed on the member 8 to limit the projection movement of the bolt. A spring 11 has one end engaging a reduced'rear end of the bolt and its other end engages a bracket 12 fastened to the plate, this spring tending to hold the bolt in projected position across the opening 4, with its front end engaging both of the guide as shown in Figure 3. A third guide 13 is fastened to the plate and engages the reduced part of the. bolt. A projection 14, is

,in the keyhole 1'7 in formed on the rear portion of the wide part of the bolt and is adapted to be engaged by the L-shaped ward 15 of the key 16, when the key is inserted the casing and turned to engage the projection. the inner face of the plate 2 and has a hole 19 therein to receive the inner end of the key, as shown in Figure 8.

When the bolt is retracted, the curved tongue 20 of a pivoted trigger 21 engages a notch 22 in 5 an intermediate part of the bolt to hold the bolt in retracted position. This trigger is pivoted to the plate 2, as shown at 23 and is forced into the notch 22 by a spring 24 having one end attached to the plate, as shown at 25. The trigger is pro- 7Q vided with a second tongue 26 which curves in an opposite direction from the tongue 20 and is adapted to be engaged by a plunger rod 27 guided by a guide sleeve 28 attached to the plate. When notch 22, from the casing through a hole 29 therein, as shown in Figure 5, so that by pressing upon this projecting end, the rod will be lowered so as to 30 move the tongue 20 of the trigger 21 out'of the notch 22 so that the spring 11 will project the bolt into locking position, as shown in Figure 3. A projection 30 on the rod limits upward movement thereof by engaging the sleeve 28. The keeper member is shown at 31, see Figure 13, and is in the form of a staple and is adapted to enter the openings 4 and 5 between the guide members 7 and 8 so that the bolt will pass through it, as shown in dotted lines in Figure 4. Thus it will be seen that the bolt is not accessible either in lockingor unlocking position and, therefore, cannot be cut, as it could if it projected from the casing and the parts are all enclosed so that it is practically impossible to pick the lock. It will be understood that when it is desired to retract the bolt,.the key 16 is inserted in the keyhole 1'7 and turned sothat the ward 15 will engage theprojection 14 on the bolt and thus move the bolt rearwardly against the action of the 1 spring 11 until the notch 22 comes opposite the tongue 20 of the trigger 21, when the spring 24 will force the tongue into the notch and thus the bolt will be held in retracted position. When it is desired to project the bolt, the rod 2'7 is pressed upon, which moves the tongue of the trigger out of the notch and permits the spring 11 to project the bolt through the keeper member.

If: i thought from the foregoing description A boss 18 is formed on 60 means for projecting the bolt, a key engaging projection on the bolt, which, when engaged by a key, will retract the bolt, a spring pressed trigger for holding the bolt retracted and a plunger rod for moving the trigger to releasing position to permit the spring to project the bolt.

' ing the bolt projected with 2. A look of the class described comprising a casing having a keeper receiving opening therein and a keyhole therein, a bolt, guides in the casing through which the bolt passes, a spring for holda part thereof extending across the opening, a trigger member pivoted in the casing and having a tongue thereon, the bolt having a notch therein for receiving the tongue, when the bolt is retracted, a spring engaging the trigger member for forcing the tongue into the notch, a plunger rod projecting from a part of the casing and engaging the triger memher to press the same to releasing position, a pr jection on the bolt adapted to be engaged by a part of a key inserted through the keyhole for retracting the bolt and guide means for the rod.

: LOUIS JOHN MILITELLO.

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